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 | Acesso ao texto completo restrito à biblioteca da Embrapa Amazônia Oriental. Para informações adicionais entre em contato com cpatu.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Amazônia Oriental. |
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Data corrente: |
02/03/2011 |
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Data da última atualização: |
11/11/2022 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
DAVIDSON, E. A.; FIGUEIREDO, R. O.; MARKEWITZ, D.; AUFDENKAMPE, A. K. |
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Afiliação: |
ERIC A. DAVIDSON, WOODS HOLE RESEARCH CENTER; RICARDO DE OLIVEIRA FIGUEIREDO, CPATU; DANIEL MARKEWITZ, UNIVERSITY OF GEORGIA; ANTHONY K. AUFDENKAMPE, STROUD WATER RESEARCH CENTER. |
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Título: |
Dissolved CO2 in small catchment streams of eastern Amazonia: A minor pathway of terrestrial carbon loss. |
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Ano de publicação: |
2010 |
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Fonte/Imprenta: |
Journal of Geophysical Research, v. 115, G04005, 2010. |
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DOI: |
10.1029/2009JG001202 |
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Idioma: |
Inglês |
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Conteúdo: |
Production of carbon dioxide (CO2) in soils can lead to supersaturation of dissolved free CO2 (pCO2) in groundwater, which later evades to the atmosphere as groundwater enters streams and rivers. This process could be a significant pathway for return of terrestrially fixed C to the atmosphere. We measured pCO2 monthly over two years at multiple stations along three streams from their headwaters in remnant mature forests through multiple land covers in Pará, Brazil. The pCO2 averaged 19,000 μatm in headwaters and decreased to about 4,500 μatm downstream. Similar values were measured in headwaters of two small pristine mature forest catchments. Two approaches were used to estimate groundwater pCO2 evasion: assuming that headwater pCO2 measurements reflected incoming groundwater pCO2 or that all entering stream water was in equilibrium with previously measured deep soil CO2. With these assumptions, losses from the terrestrial environment through aquatic evasion of pCO2 would be 0.02-0.15 Mg C ha‑1 of land area yr‑1, which is about 2-3 orders of magnitude lower than annual estimates of soil respiration and net primary productivity. However, downstream pCO2 values that appear to be in quasi-steady state indicate contributions from other C sources, such as aquatic primary production, soil erosion, dissolved organic matter, or litter inputs from streamside vegetation. Hence, lateral pCO2 loss from groundwater to streams is minor for most of the terrestrial ecosystems of this region, although C loss to streams could be significant for net terrestrial budgets in riparian ecosystems or areas experiencing erosion. MenosProduction of carbon dioxide (CO2) in soils can lead to supersaturation of dissolved free CO2 (pCO2) in groundwater, which later evades to the atmosphere as groundwater enters streams and rivers. This process could be a significant pathway for return of terrestrially fixed C to the atmosphere. We measured pCO2 monthly over two years at multiple stations along three streams from their headwaters in remnant mature forests through multiple land covers in Pará, Brazil. The pCO2 averaged 19,000 μatm in headwaters and decreased to about 4,500 μatm downstream. Similar values were measured in headwaters of two small pristine mature forest catchments. Two approaches were used to estimate groundwater pCO2 evasion: assuming that headwater pCO2 measurements reflected incoming groundwater pCO2 or that all entering stream water was in equilibrium with previously measured deep soil CO2. With these assumptions, losses from the terrestrial environment through aquatic evasion of pCO2 would be 0.02-0.15 Mg C ha‑1 of land area yr‑1, which is about 2-3 orders of magnitude lower than annual estimates of soil respiration and net primary productivity. However, downstream pCO2 values that appear to be in quasi-steady state indicate contributions from other C sources, such as aquatic primary production, soil erosion, dissolved organic matter, or litter inputs from streamside vegetation. Hence, lateral pCO2 loss from groundwater to streams is minor for most of the terrestrial eco... Mostrar Tudo |
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Palavras-Chave: |
Perda de carbono. |
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Thesaurus Nal: |
Amazonia. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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Marc: |
LEADER 02260naa a2200193 a 4500
001 1879837
005 2022-11-11
008 2010 bl uuuu u00u1 u #d
024 7 $a10.1029/2009JG001202$2DOI
100 1 $aDAVIDSON, E. A.
245 $aDissolved CO2 in small catchment streams of eastern Amazonia$bA minor pathway of terrestrial carbon loss.$h[electronic resource]
260 $c2010
520 $aProduction of carbon dioxide (CO2) in soils can lead to supersaturation of dissolved free CO2 (pCO2) in groundwater, which later evades to the atmosphere as groundwater enters streams and rivers. This process could be a significant pathway for return of terrestrially fixed C to the atmosphere. We measured pCO2 monthly over two years at multiple stations along three streams from their headwaters in remnant mature forests through multiple land covers in Pará, Brazil. The pCO2 averaged 19,000 μatm in headwaters and decreased to about 4,500 μatm downstream. Similar values were measured in headwaters of two small pristine mature forest catchments. Two approaches were used to estimate groundwater pCO2 evasion: assuming that headwater pCO2 measurements reflected incoming groundwater pCO2 or that all entering stream water was in equilibrium with previously measured deep soil CO2. With these assumptions, losses from the terrestrial environment through aquatic evasion of pCO2 would be 0.02-0.15 Mg C ha‑1 of land area yr‑1, which is about 2-3 orders of magnitude lower than annual estimates of soil respiration and net primary productivity. However, downstream pCO2 values that appear to be in quasi-steady state indicate contributions from other C sources, such as aquatic primary production, soil erosion, dissolved organic matter, or litter inputs from streamside vegetation. Hence, lateral pCO2 loss from groundwater to streams is minor for most of the terrestrial ecosystems of this region, although C loss to streams could be significant for net terrestrial budgets in riparian ecosystems or areas experiencing erosion.
650 $aAmazonia
653 $aPerda de carbono
700 1 $aFIGUEIREDO, R. O.
700 1 $aMARKEWITZ, D.
700 1 $aAUFDENKAMPE, A. K.
773 $tJournal of Geophysical Research$gv. 115, G04005, 2010.
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Embrapa Amazônia Oriental (CPATU) |
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| 3. |  | RIBEIRO, R. C.; LEMOS, W. P.; SOUZA, M. T. de; COSTA, M. B. de O. Insetos com potencial de causar danos a plantios de helicônias (Heliconiaceae) no Município de Castanhal, PA. In: SEMINÁRIO DE INICIAÇÃO CIENTÍFICA DA UFRA, 5.; SEMINÁRIO DE INICIAÇÃO CIENTÍFICA DA EMBRAPA AMAZÔNIA ORIENTAL (AVALIAÇÃO - 2007), 11., 2008, Belém, PA. Mudanças climáticas globais: sustentabilidade na Amazônia: anais. Belém, PA: UFRA: Embrapa Amazônia Oriental, 2008.| Tipo: Artigo em Anais de Congresso / Nota Técnica |
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| 6. | | SOUZA, M. T. de; LEMOS, W. de P.; RIBEIRO, R. C.; SILVA, V. C. S. da; MORAIS, J. P.; BATISTA, T. F. C. Avaliação da eficiência de concentrados de Beauveria Bassiana e Trichoderma sp. sobre o principal gafanhoto desfolhador de Heliconia spp., Cornops Frenatum Frenatum (Marschall) (Orthoptera: Acrididae). In: CONGRESSO BRASILEIRO DE ENTOMOLOGIA, 22., 2008, Uberlândia. Ciência, tecnologia e inovação: resumos. Viçosa: UFV, 2008. Resumo 1475-1.| Tipo: Resumo em Anais de Congresso |
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| 7. | | LINS, P. M. P.; RIBEIRO, R. C.; LEMOS, W. de P.; MÜLLER, A. A.; AZEVEDO, R. de; SOUZA, M. T. de S. Estimativa da sobrevivência de adultos de Homalinotus Depressus L. (Col., Curculionidae) submetidos ao insecticida Clorpirifós em laboratório. In: CONGRESSO BRASILEIRO DE ENTOMOLOGIA, 22., 2008, Uberlândia. Ciência, tecnologia e inovação: resumos. Viçosa: UFV, 2008. Resumo 1475-2.| Tipo: Resumo em Anais de Congresso |
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